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Химия Химия
Общая и неорганическая химия Общая и неорганическая химия


Analysis of the internal ventilation for a motorcycle helmet. Development and analysis of a CFD-based methodology for the numerical simulation of the internal airflow as well as sweat-related heat transfer

Автор:   Flavio C.
мягкая обложка
224 страниц
2010 год
Издательство:   Книга по Требованию
3093 руб
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Описание:The model has been mathematically analyzed and subsequently tested on sample 2D problems. However, it has the peculiarity of being potentially implementable on most commercial CFD softwares, in order to be applied to concrete 3D geometries of helmets. Thermal comfort is a fundamental issue for riders to take care of, especially in countries with very hot summer climate: the temptation of leaving out wearing the helmet turns out to be too strong if it is not sufficiently ventilated, with obvious consequences in terms of risk of injuries for the heat of the rider. At the moment there is a total lack of fluid-dynamic guidelines for the design of such ventilation systems, which are drawn only according to intuition and experience. For these reasons it is important for each helmet to be equipped with an efficient ventilation system, which should be able to remove the heat and sweat produced by the head of the rider. The scope of this thesis is to present an innovative methodology for the numerical simulation of the internal ventilation of a motorcycle helmet, based on a thermo-fluid-dynamic model capable of describing evaporation-related heat transfer phenomena.

Orthomol Immun Junior Сила иммунитета на страже Вашего ребенка Orthomol Immun Junior Сила иммунитета на страже Вашего ребенка

2990 руб
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Of Time and Space and Other Things

By the time you have ten groups of ten (a hundred), you can introduce another symbol, for instance +. Ten hun dreds, or a thousand, can become = and so on. In that case, the number "four thousand six hundred seventy-five" can be written - ++++++ To make such a set of symbols more easily graspable, we can take advantage of the ability of the eye to form a pattern. (You know how you can tell the numbers displayed by a pack of cards or a pair of dice by the pattern itself.) We could therefore write "four thousand six hundred sev enty-five" as And, as a matter of fact, the ancient Babylonians used just this system of writing numbers, but they used cunei form wedges to express it. The Greeks, in the earlier stages of their development, used a system similar to that of the Babylonians, but in later times an alternate method grew popular. They made use of another ordered system-that of the letters of the alphabet. It is natural to correlate the alphabet and the number system. We are taught both about the same time in child hood, and the two ordered systems of objects naturally tend to match up ...»

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Набор ручек гелевых с блестками "Debut", 24 цвета.
Набор ручек гелевых с блестками. В наборе: 24 цвета. Характеристики: - пулевидный пишущий узел 0,8 мм; - корпус пластиковый цветной; -
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Диаметр: 250 мм. Масштаб: 1:50 млн. Материал подставки: пластик. Цвет подставки: черный. Цвет дуги может отличаться от представленного на фото.
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